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"The thermodynamic properties of two manganese silicates pyroxmangite and fowlerite (zincian rhodonite) were experimentally determined by the Bureau of Mines. The standard enthalpies of formation were determined by hydrofluoric acid (hf) solution calorimetry, the low- temperature heat capacities by adiabatic calorimetry, and the high- temperature heat capacities by differential scanning calorimetry over the range 322 to 1,372 k. These experimentally determined values were combined with data from the literature to calculate the Gibbs energies and equillibrium constants of formation over the temperature range of the measurements. Standard enthalpies, Gibbs energies, and equillibrium constants of formation are given as a function of temperature from both the elements and the constituent oxides." - NIOSHTIC-2

"The U.S. Bureau of Mines investigated the magnetic susceptibility of minerals as a function of magnetic field strength to determine how it might affect the potential for high-field magnetic separation as an alternative to other separation technologi...

"This investigation of the thermodynamic properties of hedenbergite is one of a series being performed at the Bureau of Mines on slag- type pyroxenes, which include the pair acmite [(nafe3+)(si2o6)] and the nearly identical mineral aegirine. These py...

"The thermodynamic properties of aegirine, of composition [(na0.869Fe3+0.7362Fe2+0.16Mn0.03Ca0.1121) (Al0.141Si1.9738) (O6)], were experimentally determined at the Bureau of Mines as part of its efforts to advance minerals technology. The standard en...

The Bureau of Mines was establis4ed in the public interest to conduct inquiries and scientific and technologic investigations concerning mining and the preparation, treatment, and utilization of mineral substances; to promote health and safety in the...